CFD & Acoustic Assessment of a High-Airflow Chiller Enclosure
A combined airflow and acoustic assessment of a high-capacity chiller enclosure, developed to reduce environmental noise while maintaining acceptable aerodynamic performance through the equipment.
Reducing environmental noise without restricting airflow
The project involved the assessment of an acoustic enclosure for a large air-cooled chiller system with multiple high-capacity axial fans.
The main challenge was to reduce horizontal noise propagation while allowing the very high equipment airflow to pass through the enclosure with minimal aerodynamic resistance.
The enclosure concept used inclined internal surfaces and absorptive acoustic treatment to increase the sound path and redirect noise away from nearby receivers.
Balancing acoustic control and aerodynamic performance
CFD and acoustic modelling were used together to evaluate how the enclosure geometry influenced both airflow and sound propagation.
The assessment focused on maintaining smooth airflow through the internal channels while reducing direct horizontal transmission of fan noise.
Airflow Distribution
CFD was used to evaluate velocity distribution through the enclosure and identify regions of acceleration or recirculation.
Pressure Drop
System resistance was assessed to confirm that the acoustic treatment would not impose excessive pressure loss on the chiller fans.
Acoustic Propagation
Acoustic modelling was used to evaluate how the inclined geometry and absorptive surfaces affected environmental noise propagation.
Effective noise control with acceptable airflow resistance
The CFD analysis showed generally uniform airflow through the enclosure, with only limited local recirculation in the discharge region.
The predicted pressure drop remained within the design constraint, indicating that the enclosure could provide acoustic treatment without significantly compromising chiller airflow performance.
Acoustic modelling also showed that the inclined enclosure geometry redirected sound energy upward, reducing horizontal noise propagation toward surrounding areas.
Integrated CFD and acoustic design verification
The combined analysis demonstrated that the proposed enclosure could achieve a useful balance between acoustic attenuation and aerodynamic performance.
The inclined internal geometry and absorptive lining reduced horizontal noise propagation while maintaining effective airflow through the enclosure.
The study provided a technical basis for progressing the enclosure concept toward detailed design and fabrication.